Site-Selective Methylation of <i>N</i><sup>β</sup>-Nosyl Hydrazides of <i>N</i>-Nosyl Protected α-Amino Acids
作者:Rosaria De Marco、Antonella Leggio、Angelo Liguori、Tiziana Marino、Francesca Perri、Nino Russo
DOI:10.1021/jo1003168
日期:2010.5.21
methylation reaction of Nβ-nosyl hydrazides of N-nosyl protected α-amino acids by using diazomethane shows a controlled regiochemical trend and makes it possible to obtain the corresponding products methylated at specific positions depending on the amount of diazomethane used. The observed selectivity is closely connected with the different acidity of sulfonyl hydrazide, sulfonamide, and acyl hydrazine protons